code: def test_convert_atom_to_voxel(self):
      N = 5
      coordinates = np.random.rand(N, 3)
      atom_index = 2
      box_width = 16
      voxel_width = 1
      indices = voxel_utils.convert_atom_to_voxel(
          coordinates, atom_index, box_width, voxel_width
      )
      assert indices.shape == (3,)
  
file_path: deepchem/deepchem/utils/test/test_voxel_utils.py
imports: import numpy
  import unittest
  from deepchem.utils import voxel_utils
  from deepchem.utils import hash_utils
label_desc: Use image node_id 1 for calling the TestVoxelUtils obj's underlying member method code with example usage: obj.test_convert_atom_to_voxel() without return types